25457629287 has 4 divisors (see below), whose sum is σ = 33943505720. Its totient is φ = 16971752856.

The previous prime is 25457629279. The next prime is 25457629291. The reversal of 25457629287 is 78292675452.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 25457629287 - 2³ = 25457629279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25457629297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4242938212 + ... + 4242938217.

It is an arithmetic number, because the mean of its divisors is an integer number (8485876430).

Almost surely, 2^25457629287 is an apocalyptic number.

25457629287 is a deficient number, since it is larger than the sum of its proper divisors (8485876433).

25457629287 is an equidigital number, since it uses as much as digits as its factorization.

25457629287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8485876432.

The product of its digits is 16934400, while the sum is 57.

The spelling of 25457629287 in words is "twenty-five billion, four hundred fifty-seven million, six hundred twenty-nine thousand, two hundred eighty-seven".